Andrew's git / gitweb.git / builtin/worktree.c
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builtin / worktree.con commit Merge branch 'maint' (0233b80)
   1#include "cache.h"
   2#include "builtin.h"
   3#include "dir.h"
   4#include "parse-options.h"
   5#include "argv-array.h"
   6#include "branch.h"
   7#include "refs.h"
   8#include "run-command.h"
   9#include "sigchain.h"
  10#include "refs.h"
  11#include "utf8.h"
  12#include "worktree.h"
  13
  14static const char * const worktree_usage[] = {
  15        N_("git worktree add [<options>] <path> [<branch>]"),
  16        N_("git worktree prune [<options>]"),
  17        N_("git worktree list [<options>]"),
  18        NULL
  19};
  20
  21struct add_opts {
  22        int force;
  23        int detach;
  24        const char *new_branch;
  25        int force_new_branch;
  26};
  27
  28static int show_only;
  29static int verbose;
  30static unsigned long expire;
  31
  32static int prune_worktree(const char *id, struct strbuf *reason)
  33{
  34        struct stat st;
  35        char *path;
  36        int fd, len;
  37
  38        if (!is_directory(git_path("worktrees/%s", id))) {
  39                strbuf_addf(reason, _("Removing worktrees/%s: not a valid directory"), id);
  40                return 1;
  41        }
  42        if (file_exists(git_path("worktrees/%s/locked", id)))
  43                return 0;
  44        if (stat(git_path("worktrees/%s/gitdir", id), &st)) {
  45                strbuf_addf(reason, _("Removing worktrees/%s: gitdir file does not exist"), id);
  46                return 1;
  47        }
  48        fd = open(git_path("worktrees/%s/gitdir", id), O_RDONLY);
  49        if (fd < 0) {
  50                strbuf_addf(reason, _("Removing worktrees/%s: unable to read gitdir file (%s)"),
  51                            id, strerror(errno));
  52                return 1;
  53        }
  54        len = st.st_size;
  55        path = xmalloc(len + 1);
  56        read_in_full(fd, path, len);
  57        close(fd);
  58        while (len && (path[len - 1] == '\n' || path[len - 1] == '\r'))
  59                len--;
  60        if (!len) {
  61                strbuf_addf(reason, _("Removing worktrees/%s: invalid gitdir file"), id);
  62                free(path);
  63                return 1;
  64        }
  65        path[len] = '\0';
  66        if (!file_exists(path)) {
  67                struct stat st_link;
  68                free(path);
  69                /*
  70                 * the repo is moved manually and has not been
  71                 * accessed since?
  72                 */
  73                if (!stat(git_path("worktrees/%s/link", id), &st_link) &&
  74                    st_link.st_nlink > 1)
  75                        return 0;
  76                if (st.st_mtime <= expire) {
  77                        strbuf_addf(reason, _("Removing worktrees/%s: gitdir file points to non-existent location"), id);
  78                        return 1;
  79                } else {
  80                        return 0;
  81                }
  82        }
  83        free(path);
  84        return 0;
  85}
  86
  87static void prune_worktrees(void)
  88{
  89        struct strbuf reason = STRBUF_INIT;
  90        struct strbuf path = STRBUF_INIT;
  91        DIR *dir = opendir(git_path("worktrees"));
  92        struct dirent *d;
  93        int ret;
  94        if (!dir)
  95                return;
  96        while ((d = readdir(dir)) != NULL) {
  97                if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
  98                        continue;
  99                strbuf_reset(&reason);
 100                if (!prune_worktree(d->d_name, &reason))
 101                        continue;
 102                if (show_only || verbose)
 103                        printf("%s\n", reason.buf);
 104                if (show_only)
 105                        continue;
 106                strbuf_reset(&path);
 107                strbuf_addstr(&path, git_path("worktrees/%s", d->d_name));
 108                ret = remove_dir_recursively(&path, 0);
 109                if (ret < 0 && errno == ENOTDIR)
 110                        ret = unlink(path.buf);
 111                if (ret)
 112                        error(_("failed to remove: %s"), strerror(errno));
 113        }
 114        closedir(dir);
 115        if (!show_only)
 116                rmdir(git_path("worktrees"));
 117        strbuf_release(&reason);
 118        strbuf_release(&path);
 119}
 120
 121static int prune(int ac, const char **av, const char *prefix)
 122{
 123        struct option options[] = {
 124                OPT__DRY_RUN(&show_only, N_("do not remove, show only")),
 125                OPT__VERBOSE(&verbose, N_("report pruned objects")),
 126                OPT_EXPIRY_DATE(0, "expire", &expire,
 127                                N_("expire objects older than <time>")),
 128                OPT_END()
 129        };
 130
 131        expire = ULONG_MAX;
 132        ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 133        if (ac)
 134                usage_with_options(worktree_usage, options);
 135        prune_worktrees();
 136        return 0;
 137}
 138
 139static char *junk_work_tree;
 140static char *junk_git_dir;
 141static int is_junk;
 142static pid_t junk_pid;
 143
 144static void remove_junk(void)
 145{
 146        struct strbuf sb = STRBUF_INIT;
 147        if (!is_junk || getpid() != junk_pid)
 148                return;
 149        if (junk_git_dir) {
 150                strbuf_addstr(&sb, junk_git_dir);
 151                remove_dir_recursively(&sb, 0);
 152                strbuf_reset(&sb);
 153        }
 154        if (junk_work_tree) {
 155                strbuf_addstr(&sb, junk_work_tree);
 156                remove_dir_recursively(&sb, 0);
 157        }
 158        strbuf_release(&sb);
 159}
 160
 161static void remove_junk_on_signal(int signo)
 162{
 163        remove_junk();
 164        sigchain_pop(signo);
 165        raise(signo);
 166}
 167
 168static const char *worktree_basename(const char *path, int *olen)
 169{
 170        const char *name;
 171        int len;
 172
 173        len = strlen(path);
 174        while (len && is_dir_sep(path[len - 1]))
 175                len--;
 176
 177        for (name = path + len - 1; name > path; name--)
 178                if (is_dir_sep(*name)) {
 179                        name++;
 180                        break;
 181                }
 182
 183        *olen = len;
 184        return name;
 185}
 186
 187static int add_worktree(const char *path, const char *refname,
 188                        const struct add_opts *opts)
 189{
 190        struct strbuf sb_git = STRBUF_INIT, sb_repo = STRBUF_INIT;
 191        struct strbuf sb = STRBUF_INIT;
 192        const char *name;
 193        struct stat st;
 194        struct child_process cp;
 195        struct argv_array child_env = ARGV_ARRAY_INIT;
 196        int counter = 0, len, ret;
 197        struct strbuf symref = STRBUF_INIT;
 198        struct commit *commit = NULL;
 199
 200        if (file_exists(path) && !is_empty_dir(path))
 201                die(_("'%s' already exists"), path);
 202
 203        /* is 'refname' a branch or commit? */
 204        if (opts->force_new_branch) /* definitely a branch */
 205                ;
 206        else if (!opts->detach && !strbuf_check_branch_ref(&symref, refname) &&
 207                 ref_exists(symref.buf)) { /* it's a branch */
 208                if (!opts->force)
 209                        die_if_checked_out(symref.buf);
 210        } else { /* must be a commit */
 211                commit = lookup_commit_reference_by_name(refname);
 212                if (!commit)
 213                        die(_("invalid reference: %s"), refname);
 214        }
 215
 216        name = worktree_basename(path, &len);
 217        strbuf_addstr(&sb_repo,
 218                      git_path("worktrees/%.*s", (int)(path + len - name), name));
 219        len = sb_repo.len;
 220        if (safe_create_leading_directories_const(sb_repo.buf))
 221                die_errno(_("could not create leading directories of '%s'"),
 222                          sb_repo.buf);
 223        while (!stat(sb_repo.buf, &st)) {
 224                counter++;
 225                strbuf_setlen(&sb_repo, len);
 226                strbuf_addf(&sb_repo, "%d", counter);
 227        }
 228        name = strrchr(sb_repo.buf, '/') + 1;
 229
 230        junk_pid = getpid();
 231        atexit(remove_junk);
 232        sigchain_push_common(remove_junk_on_signal);
 233
 234        if (mkdir(sb_repo.buf, 0777))
 235                die_errno(_("could not create directory of '%s'"), sb_repo.buf);
 236        junk_git_dir = xstrdup(sb_repo.buf);
 237        is_junk = 1;
 238
 239        /*
 240         * lock the incomplete repo so prune won't delete it, unlock
 241         * after the preparation is over.
 242         */
 243        strbuf_addf(&sb, "%s/locked", sb_repo.buf);
 244        write_file(sb.buf, "initializing");
 245
 246        strbuf_addf(&sb_git, "%s/.git", path);
 247        if (safe_create_leading_directories_const(sb_git.buf))
 248                die_errno(_("could not create leading directories of '%s'"),
 249                          sb_git.buf);
 250        junk_work_tree = xstrdup(path);
 251
 252        strbuf_reset(&sb);
 253        strbuf_addf(&sb, "%s/gitdir", sb_repo.buf);
 254        write_file(sb.buf, "%s", real_path(sb_git.buf));
 255        write_file(sb_git.buf, "gitdir: %s/worktrees/%s",
 256                   real_path(get_git_common_dir()), name);
 257        /*
 258         * This is to keep resolve_ref() happy. We need a valid HEAD
 259         * or is_git_directory() will reject the directory. Any value which
 260         * looks like an object ID will do since it will be immediately
 261         * replaced by the symbolic-ref or update-ref invocation in the new
 262         * worktree.
 263         */
 264        strbuf_reset(&sb);
 265        strbuf_addf(&sb, "%s/HEAD", sb_repo.buf);
 266        write_file(sb.buf, "0000000000000000000000000000000000000000");
 267        strbuf_reset(&sb);
 268        strbuf_addf(&sb, "%s/commondir", sb_repo.buf);
 269        write_file(sb.buf, "../..");
 270
 271        fprintf_ln(stderr, _("Preparing %s (identifier %s)"), path, name);
 272
 273        argv_array_pushf(&child_env, "%s=%s", GIT_DIR_ENVIRONMENT, sb_git.buf);
 274        argv_array_pushf(&child_env, "%s=%s", GIT_WORK_TREE_ENVIRONMENT, path);
 275        memset(&cp, 0, sizeof(cp));
 276        cp.git_cmd = 1;
 277
 278        if (commit)
 279                argv_array_pushl(&cp.args, "update-ref", "HEAD",
 280                                 oid_to_hex(&commit->object.oid), NULL);
 281        else
 282                argv_array_pushl(&cp.args, "symbolic-ref", "HEAD",
 283                                 symref.buf, NULL);
 284        cp.env = child_env.argv;
 285        ret = run_command(&cp);
 286        if (ret)
 287                goto done;
 288
 289        cp.argv = NULL;
 290        argv_array_clear(&cp.args);
 291        argv_array_pushl(&cp.args, "reset", "--hard", NULL);
 292        cp.env = child_env.argv;
 293        ret = run_command(&cp);
 294        if (!ret) {
 295                is_junk = 0;
 296                free(junk_work_tree);
 297                free(junk_git_dir);
 298                junk_work_tree = NULL;
 299                junk_git_dir = NULL;
 300        }
 301done:
 302        strbuf_reset(&sb);
 303        strbuf_addf(&sb, "%s/locked", sb_repo.buf);
 304        unlink_or_warn(sb.buf);
 305        argv_array_clear(&child_env);
 306        strbuf_release(&sb);
 307        strbuf_release(&symref);
 308        strbuf_release(&sb_repo);
 309        strbuf_release(&sb_git);
 310        return ret;
 311}
 312
 313static int add(int ac, const char **av, const char *prefix)
 314{
 315        struct add_opts opts;
 316        const char *new_branch_force = NULL;
 317        const char *path, *branch;
 318        struct option options[] = {
 319                OPT__FORCE(&opts.force, N_("checkout <branch> even if already checked out in other worktree")),
 320                OPT_STRING('b', NULL, &opts.new_branch, N_("branch"),
 321                           N_("create a new branch")),
 322                OPT_STRING('B', NULL, &new_branch_force, N_("branch"),
 323                           N_("create or reset a branch")),
 324                OPT_BOOL(0, "detach", &opts.detach, N_("detach HEAD at named commit")),
 325                OPT_END()
 326        };
 327
 328        memset(&opts, 0, sizeof(opts));
 329        ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 330        if (!!opts.detach + !!opts.new_branch + !!new_branch_force > 1)
 331                die(_("-b, -B, and --detach are mutually exclusive"));
 332        if (ac < 1 || ac > 2)
 333                usage_with_options(worktree_usage, options);
 334
 335        path = prefix ? prefix_filename(prefix, strlen(prefix), av[0]) : av[0];
 336        branch = ac < 2 ? "HEAD" : av[1];
 337
 338        opts.force_new_branch = !!new_branch_force;
 339        if (opts.force_new_branch)
 340                opts.new_branch = new_branch_force;
 341
 342        if (ac < 2 && !opts.new_branch && !opts.detach) {
 343                int n;
 344                const char *s = worktree_basename(path, &n);
 345                opts.new_branch = xstrndup(s, n);
 346        }
 347
 348        if (opts.new_branch) {
 349                struct child_process cp;
 350                memset(&cp, 0, sizeof(cp));
 351                cp.git_cmd = 1;
 352                argv_array_push(&cp.args, "branch");
 353                if (opts.force_new_branch)
 354                        argv_array_push(&cp.args, "--force");
 355                argv_array_push(&cp.args, opts.new_branch);
 356                argv_array_push(&cp.args, branch);
 357                if (run_command(&cp))
 358                        return -1;
 359                branch = opts.new_branch;
 360        }
 361
 362        return add_worktree(path, branch, &opts);
 363}
 364
 365static void show_worktree_porcelain(struct worktree *wt)
 366{
 367        printf("worktree %s\n", wt->path);
 368        if (wt->is_bare)
 369                printf("bare\n");
 370        else {
 371                printf("HEAD %s\n", sha1_to_hex(wt->head_sha1));
 372                if (wt->is_detached)
 373                        printf("detached\n");
 374                else
 375                        printf("branch %s\n", wt->head_ref);
 376        }
 377        printf("\n");
 378}
 379
 380static void show_worktree(struct worktree *wt, int path_maxlen, int abbrev_len)
 381{
 382        struct strbuf sb = STRBUF_INIT;
 383        int cur_path_len = strlen(wt->path);
 384        int path_adj = cur_path_len - utf8_strwidth(wt->path);
 385
 386        strbuf_addf(&sb, "%-*s ", 1 + path_maxlen + path_adj, wt->path);
 387        if (wt->is_bare)
 388                strbuf_addstr(&sb, "(bare)");
 389        else {
 390                strbuf_addf(&sb, "%-*s ", abbrev_len,
 391                                find_unique_abbrev(wt->head_sha1, DEFAULT_ABBREV));
 392                if (!wt->is_detached)
 393                        strbuf_addf(&sb, "[%s]", shorten_unambiguous_ref(wt->head_ref, 0));
 394                else
 395                        strbuf_addstr(&sb, "(detached HEAD)");
 396        }
 397        printf("%s\n", sb.buf);
 398
 399        strbuf_release(&sb);
 400}
 401
 402static void measure_widths(struct worktree **wt, int *abbrev, int *maxlen)
 403{
 404        int i;
 405
 406        for (i = 0; wt[i]; i++) {
 407                int sha1_len;
 408                int path_len = strlen(wt[i]->path);
 409
 410                if (path_len > *maxlen)
 411                        *maxlen = path_len;
 412                sha1_len = strlen(find_unique_abbrev(wt[i]->head_sha1, *abbrev));
 413                if (sha1_len > *abbrev)
 414                        *abbrev = sha1_len;
 415        }
 416}
 417
 418static int list(int ac, const char **av, const char *prefix)
 419{
 420        int porcelain = 0;
 421
 422        struct option options[] = {
 423                OPT_BOOL(0, "porcelain", &porcelain, N_("machine-readable output")),
 424                OPT_END()
 425        };
 426
 427        ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
 428        if (ac)
 429                usage_with_options(worktree_usage, options);
 430        else {
 431                struct worktree **worktrees = get_worktrees();
 432                int path_maxlen = 0, abbrev = DEFAULT_ABBREV, i;
 433
 434                if (!porcelain)
 435                        measure_widths(worktrees, &abbrev, &path_maxlen);
 436
 437                for (i = 0; worktrees[i]; i++) {
 438                        if (porcelain)
 439                                show_worktree_porcelain(worktrees[i]);
 440                        else
 441                                show_worktree(worktrees[i], path_maxlen, abbrev);
 442                }
 443                free_worktrees(worktrees);
 444        }
 445        return 0;
 446}
 447
 448int cmd_worktree(int ac, const char **av, const char *prefix)
 449{
 450        struct option options[] = {
 451                OPT_END()
 452        };
 453
 454        if (ac < 2)
 455                usage_with_options(worktree_usage, options);
 456        if (!strcmp(av[1], "add"))
 457                return add(ac - 1, av + 1, prefix);
 458        if (!strcmp(av[1], "prune"))
 459                return prune(ac - 1, av + 1, prefix);
 460        if (!strcmp(av[1], "list"))
 461                return list(ac - 1, av + 1, prefix);
 462        usage_with_options(worktree_usage, options);
 463}